WOA!! that is one teched-out control cavity!!!! Never seen a huge chip being used in the cavity like that.
Hmm I've never heard of them being made in Korea, I thought they were made in Japan and America.

I own one of the Korean Tune's and that is how my control cavity looks like. The notch filter sets up your mid frequency. It actually changes the tone of the instrument making this bass even more versatile. The other two pots control your pickup gain. If the bass is not putting out enough volume you just boost those two pots to taste.